Wedding cake ribbon help from past brides

I am trying to figure out what length ribbon i should use for my layers of my cake. It will be a 4 tier cake done by rolling pin. If you have used a ribbon for your cake, can you let me know what width you have used. if you have a photo, it would be unbelievably helpful.

Thank you so much!

Thanks for the tips. Very nice and a good list, I will surely follow it. Thank again
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Cake Toppers